﻿#region Copyright
// Copyright (c) 2011-2012 RaisingForce Team (Alikin Sergey)
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
#endregion

using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Diagnostics.Contracts;

namespace RaisingForce.Raise.Language.RStates.Internal
{
    sealed internal class ChainContainerStateCollection<T> :
        KeyedCollection<string, T>
        where T : ChainContainerState
    {
        #region Constructors

        public ChainContainerStateCollection()
            : base()
        { }

        #endregion

        #region Private enumerable Class

        sealed private class enumerable :
            IEnumerable<T>
        {
            private readonly ChainContainerStateCollection<T> container;

            public enumerable(ChainContainerStateCollection<T> container)
            {
                this.container = container;
            }

            public IEnumerator<T> GetEnumerator()
            {
                return container.GetEnumerator();
            }

            IEnumerator IEnumerable.GetEnumerator()
            {
                return this.GetEnumerator();
            }
        }

        #endregion

        #region Public Methods

        public IEnumerable<T> GetEnumerable()
        {
            Contract.Ensures(Contract.Result<IEnumerable<T>>() != null);
            return new enumerable(this);
        }

        #endregion

        #region Base Overrides

        protected override string GetKeyForItem(T item)
        {
            return item.Name;
        }

        #endregion
    }
}
